ERC-20 is the token standard of Ethereum and every EVM chain: a common interface (transfer, balance, allowance) that makes every conforming token interchangeable with every wallet, DEX, and checkout in the ecosystem. It is why a token deployed today works with infrastructure written in 2016.
The standard covers fungible tokens only: one unit equals another. Shares, dollars, and loyalty points fit; art and deeds do not (those are ERC-721 and friends).
Every EVM asset on U.CASH, from the tokenized stocks on Robinhood Chain and Base to the dollar and euro stablecoins, moves as an ERC-20 token with its verified contract on its asset page.
Every term behind the rails, the assets, and the settlement.